*{
    margin: 0;
    padding: 0;
}

.w{
    width: 1200px;
    margin: auto;
}
.header{
    height: 42px;
    margin: 30px auto;
    opacity:0.7;
}
.logo{
    float: left;
    width: 150px;
    height: 40px;
}
.head-text{
    float: right;
    margin-left:60px ;
}
.head-text ul li{
    float: left;
    list-style-type:none;
    margin: 0 15px;
}
.head-text ul li a{
    display: block;
    height: 42px;
    padding: 0 10px;
    line-height: 42px;
    font-size: 18px;
    color: black;
    text-decoration: none;
}
.a{
    text-decoration:none ;
}
.banner{
    margin-left: 100px;
    height: 450px;
    background-color: cyan;
}

.banner-text{
    background-color: aliceblue;
    margin-top: 15px;
    margin-left: 80px;
    margin-right: 80px;
    line-height: 60px;
}


.picture{
    margin-top: 20px;
    height: 1000px;
    background-color: deepskyblue;
}
.picture ul li{
    width: 200px;
    height: 240px;
    float: left;
    list-style-type:none;
    margin-left: 10px;
    margin-top: 40px;
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;
}
.picture ul li img  {
    width: 230px;
    height: 240px;
    display: block;
    margin: auto;
}
p{
    height: 120px;
    line-height: 2em;
    text-indent: 2em;
}
